'Let-' associated with several hydronyms; possiblycommon origin with the Liet- of neighbouring country-gale meaning 'land' or 'boundary land'

Derives from the Latin romanus, meaning 'citizen of Rome'

The first known use of the appellation was attested in 16th-century by Italian humanists travelling there

From the Slavic 'Slavs'

The origin of the word Slav itself remains controversial

Theory: 'Land of the Aesti',from a people described by TacitusOther Latin forms: Estia, Hestia

From an earlier Baltic people recorded as the Ostiatoi as early as Pytheas's On the Ocean in 320 BCPossibly ultimately from the proposed Proto-Germanic *austam and Proto-Indo-European *aus- ('east')

Name comes from the Slavic tribe Čechové and, according to legend, their leader Čech, who brought them to Bohemia

It can be traced back to the Proto-Slavic root *čel-, meaning 'member of the people; kinsman', thus making it cognate to the word člověk (a person)

Language suggests that the name originates from the word 'lieti' which has the meaning to consolidate or to unite, so it may have refered to the first union of tribes

Alternative theory: Hydronymic origin, possibly from a small river Lietava, with the root meaning pourPopular Theories: derived from word lietus ('rain'), meaning a rainy place, or from Latin litus ('tubes'), a possible reference to wooden trumpets played by area tribesmen

The name may have highlighted the nature of the Christianity of the population, in contrast toBlack Ruthenia, inhabited by pagans

Or, it may have referred to the white clothing of the peopleThird explanation: The 'white' lands were those never conquered by the Tartars or Mongols

First attested in the Byzantine emperor Constantine VII 958: 'Land of the river _____'

River's name from Proto-Indo-European roots *bos or *bogh ('running water') or from a rare Latin word for 'boundary'Also contains an amalgam of Germanfor 'duke' and Serbo-Croatian for '-land'

Older, most widespread hypothesis: 'borderland'

Modern alternate theory: 'land' 'homeland' 'region' or 'country' from the Slavic kraj or krajna

Turkic: on-ogur, '(people of the) ten arrows' – in other words, 'alliance of the ten tribes'

Byzantine chronicles gave this name to them; the chroniclers mistakenly assumed that they had Turkic origins, based on their Turkic-nomadic customs and appearance

Etymology uncertainTheory: From Harahvat-, Old Persian for the Arachosia or Helmand River, or from Harahuvatiš, the surrounding land